<HTML>
<HEAD>
<TITLE>JavaScript Source Code 3000:  BG Effects:  Star Field</TITLE>
<META HTTP-EQUIV="JavaScript Source Code 3000" CONTENT = "no-cache">
<META NAME="date" CONTENT="2000-09-09">
<META NAME="channel" CONTENT="Web Developer">
<META NAME="author" CONTENT="Brian Gosselin (bgaudiodr@aol.com)">
<META NAME="section" CONTENT="BG Effects">
<META NAME="description" CONTENT="Appears as if you are flying through a star field in space.  Works in both browsers.">

<style type="text/css">
.star {
position:absolute;
layer-background-color:white;
visibility:visible;
top:-50px;
width:50px;
height:50px;
font-size:1px;
background-color:white;
}
</style>


<SCRIPT LANGUAGE="JavaScript">
<!-- Original:  Brian Gosselin (bgaudiodr@aol.com) -->
<!-- Web Site:  http://bgaudiodr.iwarp.com -->




<!-- Begin
var starnum = 75; // Number of stars
var isNS = (document.layers);
var _all = (isNS)? '' : 'all.';
var _style = (isNS) ? '' : '.style';
var xoffset, yoffset, w_x, w_y, tmpx, tmpy, scrlx, scrly;
function getstartpos(obj) {
obj.deltay = Math.floor(Math.random() * 12);
obj.deltax = Math.floor(Math.random() * 12);
obj.xdir = (Math.floor(Math.random() * 2) == 1) ? '+' : '-';
obj.ydir = (Math.floor(Math.random() * 2) == 1) ? '+' : '-';
obj.counter = 1;
if (isNS) {
obj.clip.width = 1;
obj.clip.height = 1;
obj.moveTo(xoffset+pageXOffset, yoffset+pageYOffset);
} else {
obj.width = 1;
obj.height = 1; 
obj.pixelTop = yoffset+document.body.scrollTop;
obj.pixelLeft = xoffset+document.body.scrollLeft;
   }
}
function movestar(starN) {
tmpx = starN.deltax*starN.counter+starN.counter;
tmpy = starN.deltay*starN.counter+starN.counter;
if (isNS) {
starN.clip.width = starN.counter / 3;
starN.clip.height = starN.counter / 3;
scrlx = pageXOffset;
scrly = pageYOffset;
if ((starN.left+tmpx >= w_x+scrlx) || (starN.top+tmpy >= w_y+scrly) || (starN.left-tmpx <= scrlx) || (starN.top-tmpy <= scrly)) {
getstartpos(starN);
} else {
eval('starN.moveBy('+starN.xdir+tmpx+', '+starN.ydir+tmpy+')');
   }
} else {
starN.width = starN.counter/3;
starN.height = starN.counter/3;
scrlx = document.body.scrollLeft;
scrly = document.body.scrollTop;
if ((starN.pixelLeft+tmpx >= w_x+scrlx)||(starN.pixelTop+tmpy >= w_y+scrly) || (starN.pixelLeft-tmpx <= scrlx)||(starN.pixelTop-tmpy <= scrly)) {
getstartpos(starN);
} else {
eval('starN.pixelTop'+starN.ydir+'=tmpy');
eval('starN.pixelLeft'+starN.xdir+'=tmpx');
   }
}
starN.counter++;
}
function animate() {
for(i=1; i <= starnum; i++) {
movestar(eval('star'+i));
}
setTimeout('animate()', 100);
}
function findwindowparams() {
w_x = (isNS) ? window.innerWidth : document.body.clientWidth;
w_y = (isNS) ? window.innerHeight : document.body.clientHeight;
xoffset = w_x / 2;
yoffset = w_y / 2;
for (i = 1; i <= starnum; i++) {
getstartpos(eval('star'+i));
   }
}
function resizeNS() {
setTimeout('document.location.reload()', 400);
}
(isNS) ? window.onresize = resizeNS : window.onresize = findwindowparams;
window.onload = new Function("findwindowparams(); animate();");
//  End -->
</script>
</HEAD>

<BODY vlink=#0000ff text="white" background="../img/star-field/space.jpg" /img/star-field/space.jpg">

<BR>
<center>
<table width=600 cellpadding=0 cellspacing=10>
<tr>
<td width=468 align=center>

    
    
</td>
<td width=120 align=center>
    
</td>
</tr>
</table>
<BR>
<BR>
<basefont size=3>
<FONT SIZE="+2" FACE="Helvetica,Arial">
<A HREF="../index.htm" /" TARGET="_top"><FONT COLOR="#0000FF"><b>Home</b></font></A>
<img src="../img/arrow.gif" /img/arrow.gif" height=13 width=7 border=0 alt="}">
<A HREF="index.htm" /bgeffects/"><font color="#FF0000"><b>BG Effects</b></font></A>
<img src="../img/arrow.gif" /img/arrow.gif" height=13 width=7 border=0 alt="}">
<FONT COLOR="#006666"><b>Star Field</b></font></font>
<BR>
<BR>
<table BORDER=0 WIDTH=486 CELLPADDING=3 CELLSPACING=0>
<tr><td><font FACE="helvetica,arial,geneva">
<br>
<br>
<!-- Description --><!--content_start-->
Appears as if you are flying through a star field in space.  Works in both browsers.
<hr>
</td></tr>
</table>
<!-- Demonstration -->

<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
for (i = 1; i <= starnum; i++) {
document.writeln('<div id="star'+i+'" class="star"></div>');
eval('var star'+i+'=document.'+_all+'star'+i+_style);
}
// End -->
</script>
<P>
<P>
<a name="source">
<table BORDER=0 WIDTH=486 CELLPADDING=3 CELLSPACING=0>
<tr><td BGCOLOR=yellow><font FACE="helvetica,arial,geneva" color="black"><b>JavaScript Source Code 3000:  BG Effects:  Star Field</b>
<p>Simply click inside the window below, use your cursor to highlight the script, and copy (type Control-c or Apple-c) the script into a new file in your text editor (such as Note Pad or Simple Text) and save (Control-s or Apple-s).  The script is yours!!!
<br><br></font></td></tr>
<tr><td BGCOLOR=yellow ALIGN=CENTER>
<form NAME="copy">

<DIV align="center">
<input type=button value="Highlight All" onClick="javascript:this.form.txt.focus();this.form.txt.select();">&nbsp;&nbsp;&nbsp;&nbsp;
<INPUT TYPE="text" NAME="total" VALUE="Script Size:  3.33 KB" size=24>
</DIV>

<textarea NAME="txt" ROWS=20 COLS=75 WRAP=VIRTUAL>

&lt;!-- TWO STEPS TO INSTALL STAR FIELD:

  1.  Copy the coding into the HEAD of your HTML document
  2.  Add the last code into the BODY of your HTML document  --&gt;

&lt;!-- STEP ONE: Paste this code into the HEAD of your HTML document  --&gt;

&lt;HEAD&gt;

&lt;style type="text/css"&gt;
.star {
position:absolute;
layer-background-color:white;
visibility:visible;
top:-50px;
width:50px;
height:50px;
font-size:1px;
background-color:white;
}
&lt;/style&gt;


&lt;SCRIPT LANGUAGE="JavaScript"&gt;
&lt;!-- Original:  Brian Gosselin (bgaudiodr@aol.com) --&gt;
&lt;!-- Web Site:  http://bgaudiodr.iwarp.com --&gt;

&lt;! &gt;
&lt;! &gt;

&lt;!-- Begin
var starnum = 75; // Number of stars
var isNS = (document.layers);
var _all = (isNS)? '' : 'all.';
var _style = (isNS) ? '' : '.style';
var xoffset, yoffset, w_x, w_y, tmpx, tmpy, scrlx, scrly;
function getstartpos(obj) {
obj.deltay = Math.floor(Math.random() * 12);
obj.deltax = Math.floor(Math.random() * 12);
obj.xdir = (Math.floor(Math.random() * 2) == 1) ? '+' : '-';
obj.ydir = (Math.floor(Math.random() * 2) == 1) ? '+' : '-';
obj.counter = 1;
if (isNS) {
obj.clip.width = 1;
obj.clip.height = 1;
obj.moveTo(xoffset+pageXOffset, yoffset+pageYOffset);
} else {
obj.width = 1;
obj.height = 1; 
obj.pixelTop = yoffset+document.body.scrollTop;
obj.pixelLeft = xoffset+document.body.scrollLeft;
   }
}
function movestar(starN) {
tmpx = starN.deltax*starN.counter+starN.counter;
tmpy = starN.deltay*starN.counter+starN.counter;
if (isNS) {
starN.clip.width = starN.counter / 3;
starN.clip.height = starN.counter / 3;
scrlx = pageXOffset;
scrly = pageYOffset;
if ((starN.left+tmpx &gt;= w_x+scrlx) || (starN.top+tmpy &gt;= w_y+scrly) || (starN.left-tmpx &lt;= scrlx) || (starN.top-tmpy &lt;= scrly)) {
getstartpos(starN);
} else {
eval('starN.moveBy('+starN.xdir+tmpx+', '+starN.ydir+tmpy+')');
   }
} else {
starN.width = starN.counter/3;
starN.height = starN.counter/3;
scrlx = document.body.scrollLeft;
scrly = document.body.scrollTop;
if ((starN.pixelLeft+tmpx &gt;= w_x+scrlx)||(starN.pixelTop+tmpy &gt;= w_y+scrly) || (starN.pixelLeft-tmpx &lt;= scrlx)||(starN.pixelTop-tmpy &lt;= scrly)) {
getstartpos(starN);
} else {
eval('starN.pixelTop'+starN.ydir+'=tmpy');
eval('starN.pixelLeft'+starN.xdir+'=tmpx');
   }
}
starN.counter++;
}
function animate() {
for(i=1; i &lt;= starnum; i++) {
movestar(eval('star'+i));
}
setTimeout('animate()', 100);
}
function findwindowparams() {
w_x = (isNS) ? window.innerWidth : document.body.clientWidth;
w_y = (isNS) ? window.innerHeight : document.body.clientHeight;
xoffset = w_x / 2;
yoffset = w_y / 2;
for (i = 1; i &lt;= starnum; i++) {
getstartpos(eval('star'+i));
   }
}
function resizeNS() {
setTimeout('document.location.reload()', 400);
}
(isNS) ? window.onresize = resizeNS : window.onresize = findwindowparams;
window.onload = new Function("findwindowparams(); animate();");
//  End --&gt;
&lt;/script&gt;
&lt;/HEAD&gt;

&lt;!-- STEP TWO: Copy this code into the BODY of your HTML document  --&gt;

&lt;BODY&gt;

&lt;body background="space.jpg"&gt;

&lt;SCRIPT LANGUAGE="JavaScript"&gt;
&lt;!-- Begin
for (i = 1; i &lt;= starnum; i++) {
document.writeln('&lt;div id="star'+i+'" class="star"&gt;&lt;/div&gt;');
eval('var star'+i+'=document.'+_all+'star'+i+_style);
}
// End --&gt;
&lt;/script&gt;

 

&lt;!-- Script Size:  3.33 KB --&gt;</textarea><br><font FACE="helvetica,arial,geneva"></font></td></tr>

</table>
</form>
</FONT>
</CENTER>


</center>
</body></html>
